Electric resistance.



No. 636,203. r Patented Oct. 3|, I899.

H. HELBERGER.

ELECTRIC RESISTANCE.

(Application filed Apr. 19, 1898.) (No Model.)

TH: mums PETERS ca. morouwa. WADHNDTON, o. c.

UNITED STATES PATENT OFFICE.

HUGO HELBERGER, OF

THALKIRCHEN, GERMANY.

ELECTRIC RESISTANCE.

SPECIFICATION forming part of Letters Patent N 0. 636,203, dated October31, 1899. Application filed April 19, 1898. Serial No. 678,110. (Nomodel.)

To all whom it may concern.-

Be it known that I, HUGO HELBERGER, a subject of the King of Prussia,German Emperor, residing at Thalkirchen, near Munich, in the Kingdom ofBavaria, Germany, have invented certain new and useful Improvements inElectric Resistances of Metal Foil, (for which I have applied for apatent in Germany, dated October 22, 1897, and in England, datedDecember 4, 1897, No. 28,721,) of which the following is aspecification.

This invention relates to an improved electric resistance which, inaddition to solidity, simplicity of construction, and smallest spaceoccupied, offers the advantages of a high electrio resistance andpossesses the greatest possible capacity of radiating heat.

This resistance may be utilized advantageously for electric heatingapparatus, as well as for other devices, such as rheostats for measuringapparatus, dynamo-machines, and the like.

Reference is to be had ing drawings, in Wl1lCl1- Figure l is a face viewor plan of a resistance constructed according to myinvention. Fig. 2 isa cross-section thereof, and Fig! 3 is a plan of another form ofconstruction.

to the accompany- The improved resistance consists of a nonl I lconducting backing or support1ng-plate a and a facing 79 or b of thinmetal foil pressed into the backing or supporting-plate. may be made indifferent shapes to present a short or long path for the current, theends of the facing, as indicated at c 0, being adapted for connection inany suitable manner with the electric circuit in which the resistance isto be included.

This facing The manufacture of these resistances is as follows: Ametallic film b or bsuch as is manufactured by gold-heaters as so-calledgold-leaf, silver-leaf, platinum-leaf, or alloy-leaf-is applied to anon-conducting supporting-plate or backing a, consisting of board madeof an incombustible material, such as asbestos, if the resistance isexposed to high temperatures, or of ordinary pasteboard, if theresistance develops only a small amount of heat, and then pressed bymeans of a high pressure and a stamp of any suitable construction intothe said board, exactly in the same manner as gold letters are imprintedby bookbinders into book covers. The metal layer is firmly pressed onthe c0rspoiiding places into the board, and the other superfluous metalcan easily be removed. According to the stamp employed a coherentextremely-thin metallic layer is thus formed upon the board, which, inconnection with binding-posts, may suitably be used as an electricresistance.

claim- 1. An electric resistance consisting of a nonconducting backingor supporting-plate, and a facing of metallic foil impressed upon orinto the supporting-plate.

2. An electrical resistance consisting of a backing and afacin of thinmetal foil pressed into said backing.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing Witnesses.

HUGO HELBERGER.

Witnesses EDUARD SATTLER, EMIL HENZEL.

